Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
nang mai » nang ma, nang tai, lang mai
dong hoc » dong co, dong luc
cua viet » ca viet, hoa viet, cua vat
vu sach » vu bach, su sach
mai hoi » mai khoi, dai hoi, lai hoi
cach tu » cach thuc
xa dong » ha dong, van dong, lao dong

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 mai hoi. hieu qua ((cach tu) or (cac du)) xa dong hoc cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang mai hoi. hieu qua ((cach tu) OR (cac du)) xa dong hoc cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) ky nang mai hoi. hieu qua ((cach tu) or (cac du)) xa dong hoc cua viet*".