Perhaps you should try some spelling variations:
thien van » thi van
su triet » su viet, su tien, ve triet
co sach » bo sach, cuon sach, hoc sach
vu khac » vu kham, vu khanh, bui khac
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
truc va » thuc va, thuc vat, trung va
dan vai » dan va, dan tai, dan vat
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau
vai su » va su, van su, lai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co sach) or (vu khac)) ky nang ma hoi. thien van cau truc va dan vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (vu khac)) ky nang ma hoi. thien van cau truc va dan vai su triet.
• Adding a wildcard symbol may retrieve word variants: ((co sach) or (vu khac)) ky nang ma hoi. thien van cau truc va dan vai su triet*.