Perhaps you should try some spelling variations:
thien van » thi van
hoc sach » hoc sinh, hoc cac, hoc anh
danh doi » danh di, thanh doi, dung doi
dan danh » van danh, han danh, ban danh
hieu van » hieu va, lieu va, hieu ve
nang xa » nang x, lang xa, nang ma
cam hoc » cao hoc, am hoc, cam hoa
so sanh » do sanh
doi cua » dai cua, hoi cua
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: ((hoc sach) or (so sanh)) y nang xa hoi. ((hieu van) OR (thien van)) cam hoc dan danh doi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (so sanh)) y nang xa hoi. ((hieu van) OR (thien van)) cam hoc dan danh doi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (so sanh)) y nang xa hoi. ((hieu van) OR (thien van)) cam hoc dan danh doi cua tu".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (so sanh)) y nang xa hoi. ((hieu van) OR (thien van)) cam hoc dan danh doi cua tu*.