Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
mai hoi » mai khoi, dai hoi, lai hoi
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
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: te sach v nang ((ma hoa) or (mai hoi)). hieu ((ve cam) OR (ve cac)) duc va hanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ((ma hoa) OR (mai hoi)). hieu ((ve cam) OR (ve cac)) duc va hanh hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang ((ma hoa) or (mai hoi)). hieu ((ve cam) OR (ve cac)) duc va hanh hai cua te".
• Adding a wildcard symbol may retrieve word variants: te sach v nang ((ma hoa) or (mai hoi)). hieu ((ve cam) OR (ve cac)) duc va hanh hai cua te*.