Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
va triet » va thiet, va trien, ve triet
viec cac » vien cac, viec cua, viec va
viec lam » viec va
sach ky » sac ky, sach y, sach ty
tac van » tac vang, tac va, tac can
cac van » cac dan
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
su sach » so sach, vu sach
hai va » hai van, thai va, hoi va

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 ky dang xa hoi. hieu ((viec cac) or (viec lam)) ((tac van) or (cac van)) thanh hai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xa hoi. hieu ((viec cac) OR (viec lam)) ((tac van) OR (cac van)) thanh hai va triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xa hoi. hieu ((viec cac) or (viec lam)) ((tac van) or (cac van)) thanh hai va triet*.