Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu hieu » hien hieu, hieu hien, thien hieu
hieu luc » hieu luat, hieu qua
luc nuoc » lua nuoc, luan nuoc, duoc nuoc
kinh vai » kinh hai, kinh va, kinh van
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang xa » lang xa, nang ma, mang xa
va kinh » va tinh, qua kinh
vai cua » dai cua, hai cua, lai 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) or (nang x)) hoi. hieu hieu luc nuoc va kinh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang x)) hoi. hieu hieu luc nuoc va kinh vai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang x)) hoi. hieu hieu luc nuoc va kinh vai cua triet*.