Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
cua cay » cua cac
ma hoi » mai hoi, xa hoi, ma hoa
cua cu » cua chu, cua cau, cua su

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) or (doc sach)) ty nang ma hoi. lieu va cac vuc van hanh vi ((cua cu) or (cua cay))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) ty nang ma hoi. lieu va cac vuc van hanh vi ((cua cu) OR (cua cay)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (doc sach)) ty nang ma hoi. lieu va cac vuc van hanh vi ((cua cu) or (cua cay))*.