Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
hieu van » hieu va, thien van, lieu va
danh sai » dung sai, danh bat, danh dau
chat tuc » chat xuc, luat tuc, chat huu
van chat » cao chat
hoc sach » hoc sinh, hoc cac, hoc anh
ky tang » ky dang, kho tang, ky trong
va danh » va dinh, va dan, va hanh
sai cua » dai cua, hai cua, lai cua
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: ((thuoc sach) or (hoc sach)) ((ky tang) OR (ky nang)) xa hoi. hieu van chat tuc va danh sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc sach)) ((ky tang) OR (ky nang)) xa hoi. hieu van chat tuc va danh sai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (hoc sach)) ((ky tang) OR (ky nang)) xa hoi. hieu van chat tuc va danh sai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (hoc sach)) ((ky tang) OR (ky nang)) xa hoi. hieu van chat tuc va danh sai cua tre*.