Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
dinh dat » dinh ket, dinh van, dinh lam
hieu van » hieu va, lieu va, hieu ve
cau phuc » cau truc, chau phu, huu phuc
tu sach » thu sach, su sach, te sach
dat cua » dai cua, day cua, mat cua
va dinh » van dinh, va kinh, va tinh
phuc va » phuc vu, thuc va, chuc va
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (toc sach)) ky tang xa hoi. ((hieu van) OR (thien van)) cau phuc va dinh dat cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky tang xa hoi. ((hieu van) OR (thien van)) cau phuc va dinh dat cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) ky tang xa hoi. ((hieu van) OR (thien van)) cau phuc va dinh dat cua te*".