Perhaps you should try some spelling variations:
sach hieu » sach thieu, sach tien, manh hieu
hieu lang » chieu sang, hieu quang, nhieu tang
vu sach » vu bach, su sach, vu khach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tac, cac nuoc
cac tu » cac thu, cach tu, cac du
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
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: vu sach hieu lang xa hoi. hieu va ((cac tuc) or (cac tu)) va dan vi ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach hieu lang xa hoi. hieu va ((cac tuc) OR (cac tu)) va dan vi ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: vu sach hieu lang xa hoi. hieu va ((cac tuc) or (cac tu)) va dan vi ((cua te) or (cua tu))*.