Perhaps you should try some spelling variations:
cau trung » cau truong, cac trung, cao trung
vu khach » vu khanh, vu khac, vay khach
danh vai » danh sai, danh va, doanh van
trung va » truong va, trang va, trung ha
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
thi lan » thi hanh, thi nang
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa

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