Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
luoc van » luoc can, luoc va, luot van
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
luc van » luu van, duc van, luc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang xa hoi. hieu van cam ((luc van) OR (luoc van)) hanh lai ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu van cam ((luc van) OR (luoc van)) hanh lai ((dua tren) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu van cam ((luc van) OR (luoc van)) hanh lai ((dua tren) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu van cam ((luc van) OR (luoc van)) hanh lai ((dua tren) or (cua triet))*.