Perhaps you should try some spelling variations:
tu tieng » luc tieng, tu tuong
tu trong » tu tuong
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu so » thieu so
so cham » so kham, co cham, so chat
thuc va » thuc vat, thuc dan, thuc day
y nang » ky nang, ly nang, v nang
dau vi » dau ve, dau va, dat vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang xa hoi. hieu so cham ((duc va) or (thuc va)) dau vi ((tu tieng) OR (tu trong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang xa hoi. hieu so cham ((duc va) OR (thuc va)) dau vi ((tu tieng) OR (tu trong)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang xa hoi. hieu so cham ((duc va) or (thuc va)) dau vi ((tu tieng) OR (tu trong))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. hieu so cham ((duc va) or (thuc va)) dau vi ((tu tieng) OR (tu trong))*.