Perhaps you should try some spelling variations:
lang khoa » hang khoa, dang khoa, long khoa
khoa hoc » hoa hoc
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu lang » cu lang, tu lanh, xu lang
qua cac » cua cac
xuc van » duc van, luc van, xuc ban
vuc van » duc van, luc van, thuc van
vai cua » dai cua, hai cua, lai cua
vi cua » di cua

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 tu lang khoa hoc. hieu qua cac ((xuc van) or (vuc van)) hanh ((vi cua) OR (vai cua)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu lang khoa hoc. hieu qua cac ((xuc van) OR (vuc van)) hanh ((vi cua) OR (vai cua)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu lang khoa hoc. hieu qua cac ((xuc van) or (vuc van)) hanh ((vi cua) OR (vai cua)) cau*".