Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
cham luc » cham soc, nhan luc, cham cuu
cau tren » cu tren, ca tren, cau treo
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
thu san » thuy san, thu ban, phu san
hieu va » hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
san ky » sang ky, van ky, dan ky
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu san ky tang xa hoi. ((hieu va) OR (lieu va)) cham luc va thanh va ((cau tren) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu san ky tang xa hoi. ((hieu va) OR (lieu va)) cham luc va thanh va ((cau tren) OR (dau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu san ky tang xa hoi. ((hieu va) OR (lieu va)) cham luc va thanh va ((cau tren) or (dau tren))*".