Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
trinh van » trinh han, trinh quan, trinh toan
dang xay » dang van, van xay
hien bac » mien bac, hien cac, tien bac
bac thue » bac thua, sach thue, cuc thue
va trinh » van trinh, va tinh, lap trinh
tu sach » thu sach, su sach, te sach
dang xa » lang xa, dang ha, dang va
thue va » thuc va, thuyet va, thuc vat
van chi » van chien, luan chi, van chat
chi tre » choi tre, cho tre, chi tro

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach _ ((dang xa) OR (dang xay)) hoi. hieu hien bac thue va trinh van chi tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach _ ((dang xa) OR (dang xay)) hoi. hieu hien bac thue va trinh van chi tre".
• Adding a wildcard symbol may retrieve word variants: tu sach _ ((dang xa) OR (dang xay)) hoi. hieu hien bac thue va trinh van chi tre*.