Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
vu khach » vu khac, vay khach, cua khach
hanh dai » hanh tai, hanh dao, vanh dai
vu khanh » vu thanh, van khanh, duy khanh
nang xa » nang x, lang xa, mang xa
hieu ve » hieu va, hieu van
ve nham » ve nha, ve cham
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
nang ma » tang ma, sang ma, nang cao

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) OR (nang ma)) hoi. hieu ve nham thuc va hanh dai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (vu khanh)) thu ((nang xa) OR (nang ma)) hoi. hieu ve nham thuc va hanh dai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (vu khanh)) thu ((nang xa) OR (nang ma)) hoi. hieu ve nham thuc va hanh dai cua vat".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (vu khanh)) thu ((nang xa) OR (nang ma)) hoi. hieu ve nham thuc va hanh dai cua vat*.