Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
cua viet » ca viet, hoa viet, cua vat
toan cua » than cua, tan cua, doanh cua
va trinh » van trinh, va tinh, lap trinh
cam tuc » cam xuc, cam tu, nam thuc
tu sach » thu sach, su sach, te sach
hieu va » hieu qua
xu dang » su dang, vu dang, xo dang
tu lang » cu lang, tu lanh, xu lang
tuc va » thuc va, truc va, tuc xa

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 ((tu lang) or (xu dang)) xa hoi. ((hieu va) or (lieu va)) cam tuc va trinh toan cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu lang) OR (xu dang)) xa hoi. ((hieu va) OR (lieu va)) cam tuc va trinh toan cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu lang) or (xu dang)) xa hoi. ((hieu va) or (lieu va)) cam tuc va trinh toan cua viet*.