Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
doi cua » dai cua, hoi cua
sach ha » sach nha, sach han, sach xa
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
sach va » sach xa, sach dao, sach nha
cam tuc » cam xuc, cam tu, nam thuc
va dinh » van dinh, va kinh, va tinh
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 va) or (sach ha)) nang cao hoi. hieu ve cam tuc ((va hanh) or (va dinh)) doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach va) OR (sach ha)) nang cao hoi. hieu ve cam tuc ((va hanh) OR (va dinh)) doi cua te.
• Adding a wildcard symbol may retrieve word variants: so ((sach va) or (sach ha)) nang cao hoi. hieu ve cam tuc ((va hanh) or (va dinh)) doi cua te*.