Perhaps you should try some spelling variations:
trinh vat » trinh van, trinh luat, sinh vat
ve triet » va trien, su triet
va trinh » van trinh, va tinh, lap trinh
cam loc » cam lo
hieu ve » hieu va, hieu van
su sach » vu sach
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
so sach » so sanh, bo sach, co sach
ve cam » ve cham, ve cac, va cam
loc va » hoc va, luc va
vat ve » vat va, vat de, dat ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) thu ((lang xa) or (nang ma)) hoi. hieu ve cam loc va trinh vat ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) thu ((lang xa) OR (nang ma)) hoi. hieu ve cam loc va trinh vat ve triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) thu ((lang xa) or (nang ma)) hoi. hieu ve cam loc va trinh vat ve triet*.