Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
vu sach » vu bach, su sach, vu khach
cam duc » cam xuc, cao duc, nam duoc
cao hoi » cau hoi, co hoi, cao hoc
ty nang » ky nang, ty xang, ty hang
so sanh » do sanh
cua tuc » cua duc, cua tu, cua thuoc
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sanh)) ty nang cao hoi. hieu qua ((cam duc) OR (pham duc)) ban thanh vi cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sanh)) ty nang cao hoi. hieu qua ((cam duc) OR (pham duc)) ban thanh vi cua tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (so sanh)) ty nang cao hoi. hieu qua ((cam duc) OR (pham duc)) ban thanh vi cua tuc".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sanh)) ty nang cao hoi. hieu qua ((cam duc) OR (pham duc)) ban thanh vi cua tuc*.