Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
ban thanh » ban hanh, ban hang
va triet » va thiet, va trien, ve triet
va thanh » gia thanh, va tinh, le thanh
vien da » vien dai, hien dai
sai ky » sac ky
da loc » da lop
su sai » su tai, su hai, su dai
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa
va va » va van, va vua, va vai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky nang ((o hoi) or (o hai)). hieu vien da loc ((va thanh) OR (ban thanh)) va va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky nang ((o hoi) OR (o hai)). hieu vien da loc ((va thanh) OR (ban thanh)) va va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky nang ((o hoi) or (o hai)). hieu vien da loc ((va thanh) OR (ban thanh)) va va triet*".