Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
hanh vai » hanh vi, hanh va, hanh van
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuat san)) ky nang x hoi. hieu van nam thuc va ((hanh vai) or (hanh tai)) hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat san)) ky nang x hoi. hieu van nam thuc va ((hanh vai) OR (hanh tai)) hoa viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat san)) ky nang x hoi. hieu van nam thuc va ((hanh vai) or (hanh tai)) hoa viet*.