Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
thuc dan » thuc hanh, hoc dan
hanh doi » thanh doi, hanh noi, hang doi
cua viet » ca viet, hoa viet, cua vat
nang ho » nang hoc, nang co, tang ho
thuc va » thuc day
doi cua » dai cua, hoi cua
su cac » tu cac, su cao, su can
ho hoi » hoc hoi, hoa hoi, hoi hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac ky nang ho hoi. hieu van tham ((((thuc va) OR (thuc vat))) or (thuc dan)) hanh doi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ky nang ho hoi. hieu van tham ((((thuc va) OR (thuc vat))) OR (thuc dan)) hanh doi cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac ky nang ho hoi. hieu van tham ((((thuc va) OR (thuc vat))) or (thuc dan)) hanh doi cua viet*".