Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh lai » hanh lam, hanh tai, thanh lap
ve triet » va trien, su triet
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, mang may
hieu ve » hieu va, hieu van
xa hanh » xa thanh, xa khanh, va hanh
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
lai ve » loai ve, lai va, la ve
tu xa » tu xay, tu va, te xa

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) or (nang cao)) hoi. hieu ve cac tu xa hanh lai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty ((nang ma) OR (nang cao)) hoi. hieu ve cac tu xa hanh lai ve triet.
• Adding a wildcard symbol may retrieve word variants: hoc sach ty ((nang ma) or (nang cao)) hoi. hieu ve cac tu xa hanh lai ve triet*.