Perhaps you should try some spelling variations:
thu lang » thu bang, phu lang, tho lang
thu hang » thi hang, thuc hanh, thu huong
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sai cua » dai cua, hai cua, lai cua
va danh » va dinh, va hanh, dia danh
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau

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 ((thu lang) or (thu hang)) xa hoi. hieu van cam tuc ((va danh) OR (va dan)) sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thu lang) OR (thu hang)) xa hoi. hieu van cam tuc ((va danh) OR (va dan)) sai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((thu lang) or (thu hang)) xa hoi. hieu van cam tuc ((va danh) OR (va dan)) sai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((thu lang) or (thu hang)) xa hoi. hieu van cam tuc ((va danh) OR (va dan)) sai cua tre*.