Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
cac truc » cau truc, cac tru, cac trung
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
hieu ve » hieu va
y nang » ky nang, ly nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa
v nang » va nang, vu nang, van nang
vi su » va su, ve su, ki 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 ((y nang) or (v nang)) ma hoi. ((hieu ve) OR (hieu van)) cac truc va thanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) ma hoi. ((hieu ve) OR (hieu van)) cac truc va thanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (v nang)) ma hoi. ((hieu ve) OR (hieu van)) cac truc va thanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (v nang)) ma hoi. ((hieu ve) OR (hieu van)) cac truc va thanh vi su triet*.