Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
vu khach » vu khanh, vu khac, vay khach
va hanh » van hanh, va danh, ban hanh
vu sach » vu bach, su sach
hieu va » lieu va, hieu qua
cao thu » cao thi, cac thu, ca thu
va cao » va cac, va co, va dao
ki su » ky su

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 (vu khach)) ky nang x ho. hieu va cao thu ((va thanh) or (va hanh)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang x ho. hieu va cao thu ((va thanh) OR (va hanh)) ki su triet.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khach)) ky nang x ho. hieu va cao thu ((va thanh) or (va hanh)) ki su triet*.