Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va trinh » van trinh, lap trinh, qua trinh
cua tre » cua te, cuu tre, cua triet
va tinh » may tinh
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
cau loc » hau loc, cau luc, cau long
cau hoc » cau hoi, cau hoa, cao hoc
vi cua » vai cua, di cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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 ky tang xa hoi. hieu van ((cau loc) OR (cau hoc)) ((va trinh) or (va tinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang xa hoi. hieu van ((cau loc) OR (cau hoc)) ((va trinh) OR (va tinh)) vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang xa hoi. hieu van ((cau loc) OR (cau hoc)) ((va trinh) or (va tinh)) vi cua tre*".