Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
vu sach » vu bach, su sach
nang xa » nang x, lang xa, nang ma
hieu ha » hieu hoa, hieu va, hieu ca
vai su » van su, lai su, tai su
ha am » hoa am, ha nam, ha lam

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 xa hoi. hieu ha am thuc dan hanh ((vai su) or (va su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang xa hoi. hieu ha am thuc dan hanh ((vai su) OR (va su)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) ky nang xa hoi. hieu ha am thuc dan hanh ((vai su) or (va su)) triet*".