Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
hanh cau » nhanh cau, hang cau, hanh cac
thi hanh » thi thanh
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
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 ma) OR (tang ma)) hoi. thi hanh cau truc 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 ma) OR (tang ma)) hoi. thi hanh cau truc 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 ma) OR (tang ma)) hoi. thi hanh cau truc va dan vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) ky ((nang ma) OR (tang ma)) hoi. thi hanh cau truc va dan vai cua tre*.