Perhaps you should try some spelling variations:
toc cach » hoc cach, toc sach, truoc cach
hang doi » hang di, hang loi, huong doi
dua tren » dung tren
nang xa » nang x, lang xa, nang ma
cach tu » cach thuc
va hang » van hang, va nang, va lang
tu nang » tru nang, tu nong, tu nano
cuu tre » cua tre, cau tren, cau treo
va nam » van nam, ha nam
va nay » va ngay, va cay
thu va » thuc va, thue va, tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc cach tu nang xa hoi. hieu ((va nam) OR (va nay)) thu va hang doi ((cuu tre) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc cach tu nang xa hoi. hieu ((va nam) OR (va nay)) thu va hang doi ((cuu tre) OR (dua tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc cach tu nang xa hoi. hieu ((va nam) OR (va nay)) thu va hang doi ((cuu tre) or (dua tren))".
• Adding a wildcard symbol may retrieve word variants: toc cach tu nang xa hoi. hieu ((va nam) OR (va nay)) thu va hang doi ((cuu tre) or (dua tren))*.