Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thien van » thi van
thi nang » thi cong, ki nang, thi hanh
toc sach » hoc sach, doc sach, nuoc sach
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
nam duc » nam duoc, pham duc, nam thuc
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
y dang » ky dang, 2 dang, _ dang
di cua » dai cua, doi cua, de 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: ((toc sach) OR (thuoc sach)) y dang xay hoi. ((thien van) or (thi nang)) nam duc va hang di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) y dang xay hoi. ((thien van) OR (thi nang)) nam duc va hang di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) y dang xay hoi. ((thien van) or (thi nang)) nam duc va hang di cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) y dang xay hoi. ((thien van) or (thi nang)) nam duc va hang di cua te*.