Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dan dung » van dung, tin dung
so sach » so sanh, co sach, hoc sach
bo sach » co sach, hoc sach
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
nam hoc » nam moc, nam hoi, am hoc
ap dung » xay dung, van dung
doi cua » dai cua, hoi cua
cua tuc » cua duc, cua tu, cua thuoc

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