Perhaps you should try some spelling variations:
thien van » thi van
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, te sach, tu cach
vai cua » dai cua, hai cua, lai cua
thuc va » thuc vat, thuc dan, thuc day
van cau » van dau, van hau, van chat
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » truc va, tuc xa, duc va

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) or (su sach)) ky tang ma hoi. thien van cau ((tuc va) OR (thuc va)) danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky tang ma hoi. thien van cau ((tuc va) OR (thuc va)) danh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky tang ma hoi. thien van cau ((tuc va) OR (thuc va)) danh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky tang ma hoi. thien van cau ((tuc va) OR (thuc va)) danh vai cua tre*.