Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung tuong » nhung huong, nhung phuong, hung vuong
nhieu tang » chieu sang, hieu lang, nhiet nang
theo sach » thuoc sach, te sach, theo lich
trung cho » trang cho, trong cho, trung co
cho nhung » cho chuong, cua nhung, thi nhung
tuong dan » huong dan, tung dan, xuong dan
chan cau » can cau, chinh cau, nhanh cau
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((theo sach) or (nhieu tang)) - thanh trung cho nhung tuong dan ((chan cau) OR (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((theo sach) OR (nhieu tang)) - thanh trung cho nhung tuong dan ((chan cau) OR (phan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((theo sach) or (nhieu tang)) - thanh trung cho nhung tuong dan ((chan cau) OR (phan cau))".
• Adding a wildcard symbol may retrieve word variants: hoc ((theo sach) or (nhieu tang)) - thanh trung cho nhung tuong dan ((chan cau) OR (phan cau))*.