Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cac cach » cai cach, cuoc cach, va cach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
cac bac » cac bai, cac ban, sach bac
vat cua » mat cua, bat cua, dat cua
ma cua » ca cua, manh cua, mang cua

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 tang xa hoi. hieu va ((cac bac) or (cac cach)) va van ((vat cua) or (ma cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky tang xa hoi. hieu va ((cac bac) OR (cac cach)) va van ((vat cua) OR (ma cua)) tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky tang xa hoi. hieu va ((cac bac) or (cac cach)) va van ((vat cua) or (ma cua)) tre*.