Perhaps you should try some spelling variations:
van trinh » van thinh, van tinh, dan trinh
va trinh » va tinh, lap trinh, qua trinh
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
dai huu » dao huu, dai hau, dai thua
huu tre » huu tri, cuu tre, huu them
y lang » o lang, _ lang, tay lang
am hoc » ad hoc
ve am » va am

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 y lang xa hoi. hieu ve am hoc ((va trinh) or (van trinh)) dai huu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y lang xa hoi. hieu ve am hoc ((va trinh) OR (van trinh)) dai huu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y lang xa hoi. hieu ve am hoc ((va trinh) or (van trinh)) dai huu tre*.