Perhaps you should try some spelling variations:
chau triet » cau triet, cua triet, cau trieu
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
duc van » duc va, duc tan, duc manh
ve chat » va chat, van chat
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
ve cham » va cham, vu cham, ve chim

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang ma) or (lang xa)) hoi. hieu ((ve cham) OR (ve chat)) duc van hanh lai chau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang ma) OR (lang xa)) hoi. hieu ((ve cham) OR (ve chat)) duc van hanh lai chau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang ma) or (lang xa)) hoi. hieu ((ve cham) OR (ve chat)) duc van hanh lai chau triet".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang ma) or (lang xa)) hoi. hieu ((ve cham) OR (ve chat)) duc van hanh lai chau triet*.