Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
hieu vien » hieu hien, hieu viec, thieu nien
thu sach » tu sach, thuat sach, thuoc sach
doanh va » doan va, doanh tai, doanh cua
van hoc » van hoa
van hoi » van hoa, van hoe, van loi
sach ky » sac ky, sach y, sach ty
cac xuc » cac nuoc, chat xuc, cac cuoc
ky lang » ky nang, ky dang, ky tang
va cua » va chua, via cua, ca cua
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky lang ((van hoi) or (van hoc)). hieu vien ((cac xuc) OR (cam xuc)) vay doanh va cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang ((van hoi) OR (van hoc)). hieu vien ((cac xuc) OR (cam xuc)) vay doanh va cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky lang ((van hoi) or (van hoc)). hieu vien ((cac xuc) OR (cam xuc)) vay doanh va cua su".
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang ((van hoi) or (van hoc)). hieu vien ((cac xuc) OR (cam xuc)) vay doanh va cua su*.