Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van nang » van quang, van ban, van dung
thuc van » thuc vat, thuc dan, thuc va
hanh ve » hanh vi, hanh va, hanh kem
luc van » luoc van, luu van, duc van
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
ve su » va su

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