Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
cham luc » cham soc, nhan luc, cham cuu
danh sai » dung sai, danh bat, danh dau
sach ty » sach y, sach tu, xach tay
lang xa » lang ha, dang xay, lang van
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va danh » va dinh, va dan, va hanh
sai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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 ty) or (sach thu)) lang xa hoi. hieu vu cham luc va danh sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) lang xa hoi. hieu vu cham luc va danh sai cua tre*.