Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » nam thuoc, nam thu, nam tu
tu lang » cu lang, tu lanh, xu lang
lang xa » lang ha, dang xay, lang van
va nang » van nang, da nang, cam nang
nang du » nang tu, nang luc, nang doc
du cua » duy cua, dau cua, dum 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: ((te sach) OR (toc sach)) tu lang xa hoi. thien van ((nam thuc) or (am thuc)) va nang du cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) tu lang xa hoi. thien van ((nam thuc) OR (am thuc)) va nang du cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) tu lang xa hoi. thien van ((nam thuc) or (am thuc)) va nang du cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) tu lang xa hoi. thien van ((nam thuc) or (am thuc)) va nang du cua te*.