Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va hanh » van hanh, va thanh, va danh
va lanh » va lang, va danh, va anh
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
lam tuc » lam thuoc, lam truoc, luat tuc
va lam » van lam, va lap
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi
hai su » hai vu, lai su, hai so

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ((ma hoi) or (ma hoa)). hieu va lam tuc ((va lanh) OR (va hanh)) hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((ma hoi) OR (ma hoa)). hieu va lam tuc ((va lanh) OR (va hanh)) hai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((ma hoi) or (ma hoa)). hieu va lam tuc ((va lanh) OR (va hanh)) hai su triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((ma hoi) or (ma hoa)). hieu va lam tuc ((va lanh) OR (va hanh)) hai su triet*.