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
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
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 lang 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 lang xa hoi. hieu ((viec cac) OR (viec lam)) ((tac van) OR (cac van)) thanh hai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang 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 lang xa hoi. hieu ((viec cac) OR (viec lam)) ((tac van) or (cac van)) thanh hai va triet*.