Perhaps you should try some spelling variations:
dung sai » dung tai, dung va, dung dat
su sach » so sach, vu sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cac loc » cac lop, cac toc, cac hoc
va dung » van dung, va duong, vat dung
sai cua » dai cua, hai cua, lai cua
ve cac » va cac, vien cac
loc va » hoc va, luc va
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: su sach y ((nang xa) OR (lang xa)) hoi. hieu ve cac loc va dung sai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) OR (lang xa)) hoi. hieu ve cac loc va dung sai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) OR (lang xa)) hoi. hieu ve cac loc va dung sai cua te*.