Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
vu khach » vu khac, vay khach, cua khach
vu khanh » vu thanh, van khanh, duy khanh
thu nang » thi nang, thu hang, thu bang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
lai cua » hai cua, lai chau, thai 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 khach) or (vu khanh)) thu nang xa hoi. hieu ve pham thuc va hanh ((lai cua) OR (dai cua)) vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (vu khanh)) thu nang xa hoi. hieu ve pham thuc va hanh ((lai cua) OR (dai cua)) vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (vu khanh)) thu nang xa hoi. hieu ve pham thuc va hanh ((lai cua) OR (dai cua)) vat".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (vu khanh)) thu nang xa hoi. hieu ve pham thuc va hanh ((lai cua) OR (dai cua)) vat*.