Perhaps you should try some spelling variations:
nang dai » nang tai, lang dai, nang cai
hanh hai » thanh hai, nhanh hai, hang hai
van hanh » van thanh, ban hanh, van anh
nang dau » hang dau, xang dau, nang du
cam duc » cam xuc, cao duc, pham duc
hai cua » thai cua, dai cua, hoi cua
duc van » duc va, duc tan, duc manh
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
ve cam » ve cham, ve cac, va cam
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty ((nang dai) or (nang dau)) hoi. hieu ve cam duc van hanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((nang dai) OR (nang dau)) hoi. hieu ve cam duc van hanh hai cua te*.