Perhaps you should try some spelling variations:
va thuat » ky thuat, ki thuat, va thuc
te sach » toc sach
va hang » van hang, va nang, va lang
ly hang » ly quang
hang xa » hoang xa, hang va, hang ca
va cham » va chat
sach ly » sach y, sach lo, sach ty
va tham » van tham, va thanh
hang di » hang doi, hang vi, hang dien
di cua » dai cua, doi cua, de cua
cua te » cua tu

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