Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
dang thai » dang thi, dang hai, dang khai
hoc sach » hoc sinh, hoc cac, hoc anh
thi hanh » thi thanh
bac nuoc » cac nuoc, bach tuoc, sach nuoc
thai cuu » thai cua, tai cuc, thi cuc
ty nang » ky nang, ty xang, ty hang
thi van » thi lan, thi nang
va dang » van dang, va nang, va lang
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) OR (hoc sach)) ty nang x ho. ((thi van) or (thi hanh)) bac nuoc va dang thai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc sach)) ty nang x ho. ((thi van) OR (thi hanh)) bac nuoc va dang thai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) OR (hoc sach)) ty nang x ho. ((thi van) or (thi hanh)) bac nuoc va dang thai cuu tre*".