Perhaps you should try some spelling variations:
van dung » van dong, xay dung, tin dung
vat dung » va dung, viet dung, mat duong
hieu va » lieu va, hieu qua
tai cuu » tai cuc, tai buu, tai cua
cam tuc » cam xuc, cam tu, nam thuc
cuu tre » cua tre, cau tren, cau treo
lang xa » dang xay, lang van
lang ha » long ha
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
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) or (lang ha)) hoi. hieu va cam tuc ((vat dung) OR (van dung)) tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((lang xa) OR (lang ha)) hoi. hieu va cam tuc ((vat dung) OR (van dung)) tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((lang xa) or (lang ha)) hoi. hieu va cam tuc ((vat dung) OR (van dung)) tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((lang xa) or (lang ha)) hoi. hieu va cam tuc ((vat dung) OR (van dung)) tai cuu tre*.