Perhaps you should try some spelling variations:
chat luc » chat xuc, chat lua, nhan luc
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
sach va » sach xa, sach ha, sach dao
nang ma » tang ma, sang ma, mang may
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va
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 va ((nang ma) or (nang cao)) hoi. hieu va chat luc va hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach va ((nang ma) OR (nang cao)) hoi. hieu va chat luc va hanh dai cua te*.