Perhaps you should try some spelling variations:
doan dien » toan dien, doan dieu, doan thien
dan dien » danh dien, dan den, dan vien
qua cham » qua hai, qua cac, va cham
te sach » toc sach
nang xa » nang x, lang xa, nang ma
cuc te » cua te, cuc thue, cuc tieu
doc va » duoc va, duc va, loc va
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach v nang xa hoi. hieu qua cham ((hoc va) or (doc va)) ((dan dien) OR (doan dien)) cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang xa hoi. hieu qua cham ((hoc va) OR (doc va)) ((dan dien) OR (doan dien)) cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang xa hoi. hieu qua cham ((hoc va) or (doc va)) ((dan dien) OR (doan dien)) cuc te".
• Adding a wildcard symbol may retrieve word variants: te sach v nang xa hoi. hieu qua cham ((hoc va) or (doc va)) ((dan dien) OR (doan dien)) cuc te*.