Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
va triet » va thiet, va trien, ve triet
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
dan vai » dan va, dan tai, dan vat
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, duc va
vai va » mai va, dai va, hai va

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

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