Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hang dai » hoang dai, hang tai, hang dau
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
loc va » hoc va
luc va » duc va, tuc va
ve cau » ke cau, va cau, ve cac
sach v » sach va, sach y, sach 2
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach v ((nang xa) OR (nang x)) hoi. hieu ve cau ((luc va) or (loc va)) hang dai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach v ((nang xa) OR (nang x)) hoi. hieu ve cau ((luc va) OR (loc va)) hang dai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach v ((nang xa) OR (nang x)) hoi. hieu ve cau ((luc va) or (loc va)) hang dai cua su".
• Adding a wildcard symbol may retrieve word variants: thuat sach v ((nang xa) OR (nang x)) hoi. hieu ve cau ((luc va) or (loc va)) hang dai cua su*.