Perhaps you should try some spelling variations:
thanh viet » thanh vien, than viet, anh viet
cau trung » cau truong, cac trung, cao trung
trung va » truong va, trang va, trung ha
cau tren » cu tren, dau tren, cau treo
va thanh » gia thanh, ban thanh, va tinh
ca tren » cu tren, la tren, co tren
hieu va » lieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky lang xa hoi. ((hieu va) or (hieu qua)) cau trung va thanh viet ((cau tren) OR (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang xa hoi. ((hieu va) OR (hieu qua)) cau trung va thanh viet ((cau tren) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky lang xa hoi. ((hieu va) or (hieu qua)) cau trung va thanh viet ((cau tren) OR (ca tren))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang xa hoi. ((hieu va) or (hieu qua)) cau trung va thanh viet ((cau tren) OR (ca tren))*.