Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh lap » thanh san, phan lap, thanh hai
thinh duc » tinh duc, trinh duc, trinh duoc
hanh lai » hanh lam, hanh tai, thanh loi
va thinh » van thinh, va tinh, va thanh
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
sach ky » sach y, sach ty, sach kem
sac ky » cac ky, sai ky

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 ky) OR (sac ky)) nang cao hoi. hieu va thinh duc va ((hanh lai) or (thanh lap)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang cao hoi. hieu va thinh duc va ((hanh lai) OR (thanh lap)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sac ky)) nang cao hoi. hieu va thinh duc va ((hanh lai) or (thanh lap)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sac ky)) nang cao hoi. hieu va thinh duc va ((hanh lai) or (thanh lap)) cua triet*.