Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
cau tren » cu tren, dau tren, cau treo
te sach » toc sach
tu sach » thu sach, su sach, tu cach
hieu ve » hieu va, hieu van
ca tren » cu tren, la tren, co tren
ve cam » ve cham, ve cac, va cam
cam tu » cam thu, nam tu, dam tu
va dan » ca dan, va dao, va dau

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

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