Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
nang van » dang van, tang van, lang van
hieu van » hieu va, thien van, lieu va
van nang » van quang, van ban, van dong
van hoi » van hoa, van hoc, van hoe
bo sach » co sach, hoc sach
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
su sach » so sach, vu sach
ki su » ky su

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) or (bo sach)) ky nang van hoi. hieu van nang luc ((va hanh) OR (va danh)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (bo sach)) ky nang van hoi. hieu van nang luc ((va hanh) OR (va danh)) ki su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (bo sach)) ky nang van hoi. hieu van nang luc ((va hanh) OR (va danh)) ki su triet*".