Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
su triet » su viet, su tien, ve triet
lang xa » dang xay, lang van
lang ha » long ha
sach ky » sac ky, sach y, sach ty
cau cua » cau qua, ca cua, cu cua
ban dan » ban hang, ban hanh, ban quan
dan vai » dan va, dan tai, dan vat
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ve cau » ke cau, va cau, ve cac

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 ((lang xa) OR (lang ha)) hoi. hieu ve cau cua ban dan vai ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((lang xa) OR (lang ha)) hoi. hieu ve cau cua ban dan vai ((cua tre) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((lang xa) OR (lang ha)) hoi. hieu ve cau cua ban dan vai ((cua tre) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((lang xa) OR (lang ha)) hoi. hieu ve cau cua ban dan vai ((cua tre) or (su triet))*.