Perhaps you should try some spelling variations:
thien van » thi van
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
cua viet » ca viet, hoa viet, cua vat
ly hang » ly quang
nam qua » nam quan, nam cua, nam mua
ly nang » ky nang, ly vang, ly quang
te sach » toc sach
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ly nang) or (ly hang)) xa hoi. thien van nam qua ((van hanh) OR (ban hanh)) di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ly nang) OR (ly hang)) xa hoi. thien van nam qua ((van hanh) OR (ban hanh)) di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ly nang) or (ly hang)) xa hoi. thien van nam qua ((van hanh) OR (ban hanh)) di cua viet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ly nang) or (ly hang)) xa hoi. thien van nam qua ((van hanh) OR (ban hanh)) di cua viet*.