Perhaps you should try some spelling variations:
thien van » thi van
vu khach » vu khanh, vu khac, vay khach
su sach » so sach, vu sach
va danh » va dinh, va hanh, dia danh
vai cua » dai cua, hai cua, lai cua
van cau » van dau, van hau, van chat
cao hoi » cau hoi, co hoi, cao hoc
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau

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