Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
nang cau » nang cao, hang cau, nang dau
sach hay » sach han, sach ha, sach nay
ve cham » va cham, ve chat, vu cham
va vanh » va van, va danh, va hanh
luc va » duc va, tuc va, loc va
ve cam » ve cac, va cam, ve cai
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: tu ((sach hay) or (sach y)) nang cau hoi. hieu ((ve cam) OR (ve cham)) luc va vanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hay) OR (sach y)) nang cau hoi. hieu ((ve cam) OR (ve cham)) luc va vanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach hay) or (sach y)) nang cau hoi. hieu ((ve cam) OR (ve cham)) luc va vanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach hay) or (sach y)) nang cau hoi. hieu ((ve cam) OR (ve cham)) luc va vanh dai cua te*.