Perhaps you should try some spelling variations:
chau triet » cau triet, cua triet, cau trieu
pham duy » pham duc
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duy van » duy vat, dung van

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