Perhaps you should try some spelling variations:
thien van » thi van
ve triet » va trien, su triet
hieu van » hieu va, lieu va, hieu ve
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
ban luc » van luc, bao luc, nang luc
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va
su sac » su cac, su xac
di ve » dai ve, de ve, do ve

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

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