Perhaps you should try some spelling variations:
chau triet » cau triet, cua triet, cau trieu
phan dau » phan tu, hang dau
hanh lai » hanh lam, hanh tai, thanh lap
sach ky » sach y, sach ty, sach kem
hac duc » hoc duc, ha duc, thach duc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky
va hac » van hac, va khac, va cac

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) or (sac ky)) nang ma hoi. hieu va hac duc va ((hanh lai) or (phan dau)) chau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang ma hoi. hieu va hac duc va ((hanh lai) OR (phan dau)) chau triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang ma hoi. hieu va hac duc va ((hanh lai) or (phan dau)) chau triet*.