Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
thu lang » thu hang, thu bang, phu lang
hieu van » hieu va, thien van, lieu va
tan hanh » tan thanh, tang hanh, toan hanh
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
xuc tan » duc tan, xuc tac, xuc ban
tai cau » tai cac, tai cao

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) or (((toc sach) OR (hoc sach)))) thu lang xa hoi. hieu van cam xuc tan hanh tai cau thi~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((toc sach) OR (hoc sach)))) thu lang xa hoi. hieu van cam xuc tan hanh tai cau thi*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((toc sach) OR (hoc sach)))) thu lang xa hoi. hieu van cam xuc tan hanh tai cau thi*".