Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
thu sach » tu sach, thuat sach, thuoc sach
ban hanh » ban hang
hanh hai » thanh hai, nhanh hai, hang hai
cua tre » cuu tre, cua triet, dua tren
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
cam thu » nam thu, cac thu, ca thu
thu ban » thu hang
va cam » va cham, va cac, va cao
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khach) or (thu sach)) ky tang xa hoi. lieu va cam thu ban hanh hai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (thu sach)) ky tang xa hoi. lieu va cam thu ban hanh hai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (thu sach)) ky tang xa hoi. lieu va cam thu ban hanh hai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (thu sach)) ky tang xa hoi. lieu va cam thu ban hanh hai ((cua tre) OR (cua te))*.