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