Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
mai hoi » mai khoi, dai hoi, lai hoi
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
ma hoi » xa hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua
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: doc sach ty nang ((ma hoi) OR (mai hoi)). hieu ve cam xuc ((van hanh) or (ban hanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ty nang ((ma hoi) OR (mai hoi)). hieu ve cam xuc ((van hanh) OR (ban hanh)) vi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ty nang ((ma hoi) OR (mai hoi)). hieu ve cam xuc ((van hanh) or (ban hanh)) vi cua te*".