Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
thu sach » tu sach, thuat sach, thuoc sach
cuu tre » cau tren, cau treo
nang si » nang su, nang ji, nang sinh
va nang » van nang, da nang, cam nang
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cua triet, dua tren
am hoc » ad hoc
y nang » ky nang, ly nang, v nang
va am » va lam, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (thuat san)) y nang ma hoa. hieu va am hoc va nang si ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat san)) y nang ma hoa. hieu va am hoc va nang si ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuat san)) y nang ma hoa. hieu va am hoc va nang si ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat san)) y nang ma hoa. hieu va am hoc va nang si ((cuu tre) OR (cua tre))*.