Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cao suc » cao su, cao duc
cam duc » cam xuc, cao duc, pham duc
ly hang » ly quang
ly lang » ly vang, le lang, ly lanh
cua te » cua tu

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