Perhaps you should try some spelling variations:
hoc viet » hoc hien
dinh tai » dinh toai, dinh tri, dinh thi
hieu va » lieu va, hieu qua
tai hoc » thai hoc, dai hoc, bai hoc
thu san » thuy san, thu ban, phu san
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
va dinh » van dinh, va kinh, va tinh
cam duc » cam xuc, cao duc, pham duc
tu san » tu ban, tu can, vu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu san) OR (thu san)) ky lang xa hoi. ((hieu ve) or (hieu va)) cam duc va dinh tai hoc viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (thu san)) ky lang xa hoi. ((hieu ve) OR (hieu va)) cam duc va dinh tai hoc viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) OR (thu san)) ky lang xa hoi. ((hieu ve) or (hieu va)) cam duc va dinh tai hoc viet".
• Adding a wildcard symbol may retrieve word variants: ((tu san) OR (thu san)) ky lang xa hoi. ((hieu ve) or (hieu va)) cam duc va dinh tai hoc viet*.