Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh doi » danh di, thanh doi, dung doi
thuc dan » thuc hanh, thuc vat
so sach » so sanh, co sach, hoc sach
doi cua » dai cua, hoi cua
van cam » van nam, van lam, van cau
bo sach » co sach, hoc sach
nang xa » nang x, lang xa, nang ma
v nang » va nang, vu nang, van nang
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: ((so sach) or (bo sach)) v nang xa hoi. hieu van cam ((thuc dan) or (hoc dan)) danh doi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) v nang xa hoi. hieu van cam ((thuc dan) OR (hoc dan)) danh doi cua tu.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) v nang xa hoi. hieu van cam ((thuc dan) or (hoc dan)) danh doi cua tu*.