Perhaps you should try some spelling variations:
hoc viet » hoc hien
tuc van » thuc van, truc van, duc van
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
vi hoc » li hoc, va hoc
anh vi » hanh vi, anh va, anh ve
tuc va » thuc va, truc va, tuc xa
sac ky » cac ky
ve cam » ve cham, ve cac, va cam

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) or (sai ky)) nang xa hoi. hieu ve cam ((tuc van) OR (tuc va)) anh vi hoc viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sai ky)) nang xa hoi. hieu ve cam ((tuc van) OR (tuc va)) anh vi hoc viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) or (sai ky)) nang xa hoi. hieu ve cam ((tuc van) OR (tuc va)) anh vi hoc viet".
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) or (sai ky)) nang xa hoi. hieu ve cam ((tuc van) OR (tuc va)) anh vi hoc viet*.