Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thu lang » thu hang, phu lang, tho lang
dung sai » dung tai, dung va, dung dat
thu bang » thu ban, thu hang, chu bang
danh sai » danh bat, danh dau, hanh san
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa

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