Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
hang tai » hang va, dung tai
thuc va » thuc vat, thuc dan, thuc day
hanh va » hang va, hanh vi
tu sac » tu sach, tu cac, tu bac
tu san » thu san, tu ban, tu can
x hoi » xa hoi, o hoi, x ho
chua » cua, chu

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

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