Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
dung doi » huong doi, dung tai, dung co
thuc dan » thuc hanh, thuc vat
doi cua » dai cua, hoi cua
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
so sanh » do sanh
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (so sanh)) ly nang xa hoi. hieu van cam ((thuc dan) or (hoc dan)) dung doi cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (so sanh)) ly nang xa hoi. hieu van cam ((thuc dan) OR (hoc dan)) dung doi cua cu.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (so sanh)) ly nang xa hoi. hieu van cam ((thuc dan) or (hoc dan)) dung doi cua cu*.