Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
luoc van » luoc can, luc van, luot van
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
luoc va » nuoc va, duoc va, loc va
vi cua » vai cua, di cua

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 va) or (lieu va)) nhan ((luoc van) OR (luoc va)) hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. ((hieu va) OR (lieu va)) nhan ((luoc van) OR (luoc va)) hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. ((hieu va) or (lieu va)) nhan ((luoc van) OR (luoc va)) hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. ((hieu va) or (lieu va)) nhan ((luoc van) OR (luoc va)) hanh vi cua triet*.