Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
ban danh » ban doanh, ban hanh, ban dan
cau cua » cau qua, ca cua, cu cua
cua tre » cua te, cuu tre, cua triet
so viet » hoc viet
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
tu sach » thu sach, su sach, te sach
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (tu sach)) ky tang xa hoi. hieu ve cau cua ban danh vai ((cua tre) or (so viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (tu sach)) ky tang xa hoi. hieu ve cau cua ban danh vai ((cua tre) OR (so viet)).
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (tu sach)) ky tang xa hoi. hieu ve cau cua ban danh vai ((cua tre) or (so viet))*.