Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cau treo » cau theo, cau tren, cau triet
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
dan vai » dan va, dan vat, den vai
dan tai » van tai, dan thi, han tai
va am » va lam, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((ky lang) OR (ky nang)) xa hoi. hieu va am thuc va ((dan vai) or (dan tai)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ky lang) OR (ky nang)) xa hoi. hieu va am thuc va ((dan vai) OR (dan tai)) cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ky lang) OR (ky nang)) xa hoi. hieu va am thuc va ((dan vai) or (dan tai)) cau treo".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ky lang) OR (ky nang)) xa hoi. hieu va am thuc va ((dan vai) or (dan tai)) cau treo*.