Perhaps you should try some spelling variations:
te sach » toc sach
van hoi » van hoa, van hoc, van loi
van hoe » van hoa, van hoc, van hieu
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
sach v » sach va, sach y, sach 2
v lang » va lang, o lang, _ lang
cua tu » cua tuc, cua su, cua cu

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 v lang ((van hoi) OR (van hoe)). hieu qua cac duc va hang di ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v lang ((van hoi) OR (van hoe)). hieu qua cac duc va hang di ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v lang ((van hoi) OR (van hoe)). hieu qua cac duc va hang di ((cua te) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: te sach v lang ((van hoi) OR (van hoe)). hieu qua cac duc va hang di ((cua te) or (cua tu))*.