Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
ve cham » va cham, ve chat, vu cham
vu kham » vu khanh
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va
vai va » mai va, dai va, hai va
vi va » vi van, vu va, bi va
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 ky nang cao hoi. hieu ((ve cham) or (vu kham)) luc va hanh ((vi va) OR (vai va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang cao hoi. hieu ((ve cham) OR (vu kham)) luc va hanh ((vi va) OR (vai va)) thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang cao hoi. hieu ((ve cham) or (vu kham)) luc va hanh ((vi va) OR (vai va)) thiet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang cao hoi. hieu ((ve cham) or (vu kham)) luc va hanh ((vi va) OR (vai va)) thiet*.