Perhaps you should try some spelling variations:
thien van » thi van
ban hanh » ban hang
van cam » van nam, van lam, van cau
hai cua » thai cua, hoi cua, lai cua
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
su sach » vu sach
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
so sach » so sanh, bo sach, co sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) ky tang xa hoi. thien van cam duc ban hanh ((hai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky tang xa hoi. thien van cam duc ban hanh ((hai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky tang xa hoi. thien van cam duc ban hanh ((hai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky tang xa hoi. thien van cam duc ban hanh ((hai cua) or (dai cua)) tre*.