Perhaps you should try some spelling variations:
chau triet » cau triet, cua triet, cau trieu
duc tuan » duc thuan, duc tan, duc toan
hanh lai » hanh tai, thanh lap, thanh loi
hanh lam » thanh lap, hanh kem, hanh va
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. hieu ve pham duc tuan ((hanh lai) or (hanh lam)) chau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ma hoi. hieu ve pham duc tuan ((hanh lai) OR (hanh lam)) chau triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. hieu ve pham duc tuan ((hanh lai) or (hanh lam)) chau triet*.