Perhaps you should try some spelling variations:
thien van » thi van
danh vai » danh sai, danh va, doanh van
dang xay » dang van, van xay
tu sach » thu sach, te sach, tu cach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
van cau » van dau, van hau, van chat
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet

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