Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
hanh hai » thanh hai, nhanh hai, hang hai
van hanh » van thanh, ban hanh, van anh
hai cua » thai cua, dai cua, hoi cua
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
te sach » toc sach
sach vu » sach va, sach tu, sach uu
mai hoi » dai hoi, lai hoi, mai doi
vu nang » vuc nang, va nang, vu dang
ve cam » ve cham, ve cac, va cam
ma hoi » xa hoi, ma hoa, me hoi
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach vu nang ((ma hoi) or (((mai hoi) OR (mai khoi)))). hieu ve cam duc van hanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach vu nang ((ma hoi) OR (((mai hoi) OR (mai khoi)))). hieu ve cam duc van hanh hai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach vu nang ((ma hoi) or (((mai hoi) OR (mai khoi)))). hieu ve cam duc van hanh hai cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach vu nang ((ma hoi) or (((mai hoi) OR (mai khoi)))). hieu ve cam duc van hanh hai cua tu*.