Perhaps you should try some spelling variations:
tri nang » tra nang, tri bang, tri mang
thi nang » thi cong, ki nang, thi hanh
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
doi cua » dai cua, hoi cua
cuc ban » cua ban, cac ban, cuu ban
nam cuc » nam cac, nam cua, nam thuc
hieu va » lieu va, hieu qua
di cua » dai cua, de cua, do cua
va nam » van nam, ha nam, va nay

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 ((tri nang) OR (thi nang)) ma hoa. hieu va nam cuc ban hanh ((di cua) or (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tri nang) OR (thi nang)) ma hoa. hieu va nam cuc ban hanh ((di cua) OR (doi cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tri nang) OR (thi nang)) ma hoa. hieu va nam cuc ban hanh ((di cua) or (doi cua)) tre*".