Perhaps you should try some spelling variations:
phap thong » phap phong, phap chong, pho thong
khoa phap » khoa phau, khoan phai, khong phap
thuc lanh » thuc hanh, thuat lanh, thuc thanh
sach tri » sach tai, sach tren, sach truc
sach bai » sach dao, cac bai, sach xa
cac khoa » cac khoan, cac khoi, dac khoa
tri thuc » tri tue
bai hoc » dai hoc
hoc cac » hoc cao
te sach » toc sach
va ghe » va nghe, va che, va ghi
va he » va che, va de, va le

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 tri thuc lanh ((va he) OR (va ghe)) thong ) or ( te sach bai hoc cac khoa phap thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tri thuc lanh ((va he) OR (va ghe)) thong ) OR ( te sach bai hoc cac khoa phap thong )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach tri thuc lanh ((va he) OR (va ghe)) thong ) or ( te sach bai hoc cac khoa phap thong ))".
• Adding a wildcard symbol may retrieve word variants: (( te sach tri thuc lanh ((va he) OR (va ghe)) thong ) or ( te sach bai hoc cac khoa phap thong ))*.