Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van lang » van nang, va lang, van hang
tu sach » su sach, te sach, tu cach
viec va » vien va, viec cua
lang ca » lang cua, lang cao, hang ca
tan van » tran van, tang van, luan van
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ca cuu » cap cuu, cua cuu, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) y nang ma hoa. hieu ((viec lam) OR (viec va)) tan van lang ca cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang ma hoa. hieu ((viec lam) OR (viec va)) tan van lang ca cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y nang ma hoa. hieu ((viec lam) OR (viec va)) tan van lang ca cuu tre*".