Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, cam thu, can thuc
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, le thanh
thu san » thuy san, thu ban, phu san
nang xa » nang x, lang xa, nang ma
va tinh » may tinh
san ky » sang ky, van ky, dan ky
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu san ky nang xa hoi. hieu van ((cam thuc) OR (nam thuc)) ((va thanh) or (va tinh)) dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu san ky nang xa hoi. hieu van ((cam thuc) OR (nam thuc)) ((va thanh) OR (va tinh)) dai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu san ky nang xa hoi. hieu van ((cam thuc) OR (nam thuc)) ((va thanh) or (va tinh)) dai cua tu".
• Adding a wildcard symbol may retrieve word variants: thu san ky nang xa hoi. hieu van ((cam thuc) OR (nam thuc)) ((va thanh) or (va tinh)) dai cua tu*.