Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
cau tren » cu tren, dau tren, ca tren
hieu va » lieu va, hieu qua
tuc cac » tu cac, tich cac
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
tuc ca » tuc cua, tuc xa, tuc co
ca cau » cua cau, cac cau, can cau

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 nang cau hoi. hieu va cam ((tuc ca) OR (tuc cac)) dan ca cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang cau hoi. hieu va cam ((tuc ca) OR (tuc cac)) dan ca cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang cau hoi. hieu va cam ((tuc ca) OR (tuc cac)) dan ca cau tren*.