Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
thai cua » than cua, tai cuc, tri cua
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va lang » va nang, hoa lang
va dang » van dang, va nang, da dang
van cac » van hac, van cau, van bac
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi
cua te » cua tu

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 nang ((ma hoi) or (mai hoi)). hieu van cac nuoc ((va dang) OR (va lang)) thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((ma hoi) OR (mai hoi)). hieu van cac nuoc ((va dang) OR (va lang)) thai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ((ma hoi) or (mai hoi)). hieu van cac nuoc ((va dang) OR (va lang)) thai cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((ma hoi) or (mai hoi)). hieu van cac nuoc ((va dang) OR (va lang)) thai cua te*.