Perhaps you should try some spelling variations:
thanh gi » thanh nghi, thanh gian, thanh hai
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
te sach » toc sach
sang ma » tang ma, nang ma, sang tao
nang xa » nang x, lang xa, nang ma
ve cam » ve cham, ve cac, va cam
luc va » tuc va, loc va
gi va » bi va, gi la, gi ta
thiet » thieu

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 ty ((nang xa) or (sang ma)) hoi. hieu ve cam ((luc va) OR (duc va)) thanh gi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang xa) OR (sang ma)) hoi. hieu ve cam ((luc va) OR (duc va)) thanh gi va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((nang xa) or (sang ma)) hoi. hieu ve cam ((luc va) OR (duc va)) thanh gi va thiet".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang xa) or (sang ma)) hoi. hieu ve cam ((luc va) OR (duc va)) thanh gi va thiet*.