Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dan danh » han danh, ban danh, dai danh
van danh » van doanh, van anh, van hanh
so sach » so sanh, bo sach, co sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
nam hoc » nam moc, nam hoi, nam ho
doi cua » dai cua, hoi cua
cua tuc » cua duc, cua tu, cua thuoc
am hoc » ad hoc

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 ly nang xa hoi. hieu van ((nam hoc) OR (am hoc)) ((dan danh) or (van danh)) doi cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly nang xa hoi. hieu van ((nam hoc) OR (am hoc)) ((dan danh) OR (van danh)) doi cua tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ly nang xa hoi. hieu van ((nam hoc) OR (am hoc)) ((dan danh) or (van danh)) doi cua tuc".
• Adding a wildcard symbol may retrieve word variants: so sach ly nang xa hoi. hieu van ((nam hoc) OR (am hoc)) ((dan danh) or (van danh)) doi cua tuc*.