Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
trinh van » trinh han, trinh quan, trinh toan
choi tre » cho tre, tuoi tre, khoe tre
van choi » van chi, van cho, van hoi
vien bac » vien bach, vien cac, mien bac
thu sach » tu sach, thuat sach, thuoc sach
thue va » thuc va, thuyet va, thuc vat
dang xa » dang xay, lang xa, dang ha
te sach » toc sach

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) or (thu sach)) _ dang xa hoi. hieu vien bac ((nhue va) OR (thue va)) trinh van choi tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) _ dang xa hoi. hieu vien bac ((nhue va) OR (thue va)) trinh van choi tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) _ dang xa hoi. hieu vien bac ((nhue va) OR (thue va)) trinh van choi tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) _ dang xa hoi. hieu vien bac ((nhue va) OR (thue va)) trinh van choi tre*.