Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
hanh lai » hanh lam, hanh tai, thanh lap
sach ty » sach y, sach tu, sach thu
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
van cau » van dau, van hau, van chat
chau te » chau tho
mac va » mac ca, tac va, ac va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty ((nang xa) or (lang xa)) hoi. thien van cau ((mac va) or (duc va)) hanh lai chau te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang xa) OR (lang xa)) hoi. thien van cau ((mac va) OR (duc va)) hanh lai chau te.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang xa) or (lang xa)) hoi. thien van cau ((mac va) or (duc va)) hanh lai chau te*.