Perhaps you should try some spelling variations:
thanh pha » thanh phan, thanh pham, thanh pho
hoc sach » hoc sinh, hoc cac, hoc anh
quoc ban » quoc bao, quoc lan, quoc quan
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
luc van » luoc van, luu van, duc van
nang xa » nang x, lang xa, nang ma
co viet » so viet, o viet, hoc viet
ve cac » va cac, vien cac
pha co » phan co, phai co, pa co

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky nang xa hoi. hieu ((ve cham) or (ve cac)) ((quoc ban) or (luc van)) thanh pha co viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang xa hoi. hieu ((ve cham) OR (ve cac)) ((quoc ban) OR (luc van)) thanh pha co viet.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. hieu ((ve cham) or (ve cac)) ((quoc ban) or (luc van)) thanh pha co viet*.