Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thi hang » thi hanh, thi hong, thi thanh
thi nang » thi cong, ki nang, thi hanh
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
hanh tu » anh tu, danh tu
va hanh » van hanh, va thanh, ban hanh
cuu tre » cua tre, cau tren, cau treo
tu cuu » tu huu, tu cua, tu chu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((thi hang) or (thi nang)) xa hoi. thi ((van thanh) or (ban hang)) hoc va hanh tu cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thi hang) OR (thi nang)) xa hoi. thi ((van thanh) OR (ban hang)) hoc va hanh tu cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((thi hang) or (thi nang)) xa hoi. thi ((van thanh) or (ban hang)) hoc va hanh tu cuu tre*.