Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ve triet » va trien, su triet
va triet » va thiet, va trien, cua triet
tu thanh » thu thanh, su thanh, ta thanh
cam tuc » cam xuc, cam tu, nam thuc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tai hai » thi hai, dai hai, tai ha
tai hoi » tai khoi, dai hoi, tai hoe
ky hang » ky nang, ly hang, ky dang
tuc tu » thuc tu, truc tu, luc tu
ve cam » ve cham, ve cac, va cam

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 ky hang ((tai hoi) OR (tai hai)). hieu ve cam tuc tu thanh dai ((va triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky hang ((tai hoi) OR (tai hai)). hieu ve cam tuc tu thanh dai ((va triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky hang ((tai hoi) OR (tai hai)). hieu ve cam tuc tu thanh dai ((va triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky hang ((tai hoi) OR (tai hai)). hieu ve cam tuc tu thanh dai ((va triet) or (ve triet))*.