Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
toc sac » toc sach, toc san, hoc sach
nang xa » nang x, lang xa, nang ma
ve caic » ve cac
ve cai » va cai, ve cac, ve tai
sac ky » cac ky, sai ky
do van » dao van, vo van, so van
doi va » hoi va, noi va, dai va
di va » dai va, di vao, di vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky nang xa hoi. hieu ((ve cai) or (ve caic)) do van hanh ((di va) OR (doi va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky nang xa hoi. hieu ((ve cai) OR (ve caic)) do van hanh ((di va) OR (doi va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky nang xa hoi. hieu ((ve cai) or (ve caic)) do van hanh ((di va) OR (doi va)) triet".
• Adding a wildcard symbol may retrieve word variants: toc sac ky nang xa hoi. hieu ((ve cai) or (ve caic)) do van hanh ((di va) OR (doi va)) triet*.