Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dang tai » dang thai, hang tai, dang thi
hanh dai » hanh tai, hanh dao, vanh dai
ve triet » va trien, su triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cac hoc » cach hoc, cac hop, bac hoc
va hanh » van hanh, va thanh, va danh
ve cac » va cac, vien cac
dai ve » dap ve, dau ve, dai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky ((dang tai) or (dung tai)) hai. hieu ve cac hoc va hanh dai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((dang tai) OR (dung tai)) hai. hieu ve cac hoc va hanh dai ve triet.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((dang tai) or (dung tai)) hai. hieu ve cac hoc va hanh dai ve triet*.