Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang va » nang van, hang va, nang ma
sach tu » sach thu, sach ty, sach uu
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
cach tu » cach thuc
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca cua
va lam » van lam, va lap

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

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