Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh vai » hanh va, hanh tai, hanh van
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
sach v » sach va, sach 2, sach vay
ve cam » ve cham, ve cac, va cam
cam tu » cam thu, nam tu, dam tu

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 v) or (sach y)) nang ma hoi. hieu ve cam tu va ((hanh vai) or (hanh vi)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach v) OR (sach y)) nang ma hoi. hieu ve cam tu va ((hanh vai) OR (hanh vi)) va triet.
• Adding a wildcard symbol may retrieve word variants: su ((sach v) or (sach y)) nang ma hoi. hieu ve cam tu va ((hanh vai) or (hanh vi)) va triet*.