Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
kem cau » ket cau, ke cau, kem chu
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tac, cac nuoc
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
dan ky » van ky
cac tu » cac thu, cach tu, cac du
tu dan » tuc dan, tu ban, cu dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu dan ky ((lang xa) or (nang x)) hoi. hieu ve ((cac tuc) or (cac tu)) va hanh kem cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ky ((lang xa) OR (nang x)) hoi. hieu ve ((cac tuc) OR (cac tu)) va hanh kem cau tren.
• Adding a wildcard symbol may retrieve word variants: tu dan ky ((lang xa) or (nang x)) hoi. hieu ve ((cac tuc) or (cac tu)) va hanh kem cau tren*.