Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
chau tho » chat thom, cau thi, phu tho
van hanh » van thanh, ban hanh, van anh
san hanh » san thanh, ban hanh, dan hanh
cap nuoc » dat nuoc
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
ca tren » cau tren, cu tren, la tren
ve cap » ve cac, le cap, ve cai
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang x hoi. hieu ve cap nuoc ((san hanh) OR (van hanh)) lam ((chau tho) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang x hoi. hieu ve cap nuoc ((san hanh) OR (van hanh)) lam ((chau tho) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang x hoi. hieu ve cap nuoc ((san hanh) OR (van hanh)) lam ((chau tho) or (ca tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang x hoi. hieu ve cap nuoc ((san hanh) OR (van hanh)) lam ((chau tho) or (ca tren))*.