Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cua tre » cua te, cuu tre, dua tren
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va cau » van cau, va cac, va dau
tuc va » thuc va, truc va, tuc xa
xac va » tac va, ac va, bac 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 ky lang xa hoi. hieu va cau ((xac va) or (tuc va)) hanh vi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu va cau ((xac va) OR (tuc va)) hanh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. hieu va cau ((xac va) or (tuc va)) hanh vi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu va cau ((xac va) or (tuc va)) hanh vi ((cua tre) OR (cua triet))*.