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
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
so sach » so sanh, co sach, hoc sach
ly nang » ky nang, ly hang, ly vang
bo sach » co sach, hoc sach
y nang » ky nang, v nang, may 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)) ((y nang) OR (ly 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: ((so sach) OR (bo sach)) ((y nang) OR (ly nang)) xa hoi. hieu van cam thuc dan danh doi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (bo sach)) ((y nang) OR (ly nang)) xa hoi. hieu van cam thuc dan danh doi cua tu".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) ((y nang) OR (ly nang)) xa hoi. hieu van cam thuc dan danh doi cua tu*.